Dynamic lateral shearing interferometer

Details Dynamic lateral shearing interferometer Dynamic lateral shearing interferometer

1991-02-19

1993-12-14

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01B 902

Patent

active

052707920

ABSTRACT:
A parallel plate lateral shearing interferometer allows the shearing plate to oscillate through a small angle periodically causing the interference fringe pattern to translate on a display surface providing an indication of the direction of adjustment required to collimate a beam. At the point of exact collimation the interference pattern changes abrubtly to a blinking pattern of dark and light. In one embodiment the shearing plate is oscillated by a new kind of electronic translator that functions by thermal expansion and contraction, and in another embodiment the shearing plate moves as a pendulum. An alternative embodiment of the translator is also provided for non-oscillatory precision translations.

REFERENCES:
patent: 4786175 (1988-11-01), Duffus

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